Our developers who use Eclipse want to connect to Maven repository from our company network.

As Maven repository can be anywhere in the world (any IP) and we can only allow connection to IP address (not hosts, like maven.apache.org). We don't want to allow connection to any ip in the world, just only specific ip addresses.

As it is not possible, that is why would like to control the connection with our proxy. We don't want to install Maven proxy.

I would like to know if Eclipse can handle / support any kind of authetication like NTLM or Kerberos (Kerberos prefered).

If you're using Maven from Eclipse, you're likely to use m2e for that purpose, so perhaps the m2e mailing list can get you an answer, but from how I understand the architecture, also m2e only delegates to Maven - so questions of how Maven accesses remote repositores are just Maven questions (might be as simple as setting your proxy as the only repository in your Maven settings.xml??)